axis - definition and synonyms

noun [countable] 

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/ˈæksɪs/
singularaxis
pluralaxes
  1. 1
    astronomy an imaginary line through the middle of an object such as a planet, round which it seems to spin

    The Earth rotates barely perceptibly on its axis.

    1. a.
      maths an imaginary line that divides a square, circle, or other regular shape into two equal halves

      an axis of symmetry

  2. 3
    an agreement between two or more countries or people that gives them power or influence

    the Paris-Berlin axis